Acetaldehyde (C07C47/06)

Catalyst (versions), preparation method thereof and method of producing acetaldehyde // 2600452
FIELD: chemistry.SUBSTANCE: invention relates to catalysts (versions) for producing acetaldehyde in isomerisation of ethylene oxide, as well as to a method of preparing said catalysts. Active component of catalyst comprises zeolite of structure: MTT, TON, having composition: x Al2O3 - y El2O - SiO2, where x=0.1-510-2; y=210-3, El is at least one of elements of group 1 of periodic table, a compound which is used for hydrothermal synthesis of zeolite, or zeolite of same composition and structure subjected to thermo-steam treatment, selected from following: MFI, MEL, BEA, FER, MOR, FAU. Invention also relates to a method of producing acetaldehyde in isomerisation of ethylene oxide by passing steam-gas mixture of ethylene oxide with gas diluent, which can be nitrogen and/or any inert gas, and/or carbon dioxide, and/or air, and/or water vapour, through a layer of catalyst in presence of disclosed catalysts (versions).EFFECT: technical result is increasing conversion of ethylene oxide and selectivity on acetaldehyde, which provides high output of acetaldehyde.9 cl, 1 tbl, 36 ex

Catalyst for ethanol processing and method of obtaining acetaldehyde and hydrogen from ethanol with application thereof // 2558368
FIELD: chemistry.SUBSTANCE: catalyst represents mesoporous silica gel (Ssp.=100-300 m2/g) with applied on its surface silver in a quantity of 1-8% of the catalyst weight, which is in a highly disperse (nanosize) condition with the average size of particles of 2.8 nm. The claimed catalyst contains one or several oxides from CeO2, MnOx, ZrO2, FeOx with their summary content of 0.5-8% of the catalyst weight. The claimed invention also relates to methods of obtaining acetaldehyde and acetaldehyde together with hydrogen.EFFECT: catalyst has high activity in the transformation of ethanol into acetaldehyde.3 cl, 3 dwg, 3 tbl, 7 ex

Removing acetaldehyde from methyl acetate by high-pressure rectification // 2470007
FIELD: chemistry.SUBSTANCE: invention relates to methods of removing acetaldehyde from a mixture of methyl acetate, methanol and acetaldehyde, one of which involves: (a) feeding the mixture of methyl acetate, methanol and acetaldehyde into a rectification column; (b) rectification of the mixture of methyl acetate, methanol and acetaldehyde at pressure of 68.95 kPa (10 pounds/square inch) or higher to form a vapour stream output from the top of the column which is rich in acetaldehyde compared to the mixture, and a bottom residue poor in acetaldehyde compared to the mixture; (c) returning as reflux a portion of the vapour stream which is output from the top of the column into the rectification column; and (d) removing a stream of the bottom residue poor in acetaldehyde from the rectification column, where temperature of the vapour stream from the top of the column ranges from 85C to 115C. The invention also relates to a method of producing acetic acid, involving: (a) cleaning the mixture of methyl acetate, methanol and acetaldehyde with removal of acetaldehyde by: (i) feeding the mixture of methyl acetate, methanol and acetaldehyde into a rectification column; (ii) rectification of the mixture of methyl acetate, methanol and acetaldehyde at pressure of 68.95 kPa (10 pounds/square inch) or higher to form a vapour stream which is output from the top of the column which is rich in acetaldehyde compared to the mixture, and a bottom residue poor in acetaldehyde compared to the mixture; (iii) returning as reflux a portion of the vapour stream output from the top of the column into the rectification column; and (iv) removing a stream of the bottom residue poor in acetaldehyde from the rectification column; (b) feeding the cleaned stream of bottom residue into the reaction mixture for carbonylation together with carbon oxide, where the reaction mixture for carbonylation contains water, a catalyst selected from rhodium catalysts, iridium catalysts or mixtures thereof, a promoter from methyl iodide and acetic acid; and (c) extracting acetic acid from the carbonylation mixture, where temperature of the stream which is output from the top of the column ranges from 85C to 115C.EFFECT: improved methods.15 cl, 8 dwg, 6 tbl, 16 ex
 
2551075.
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